package com.lebang.medicalInquiry.utils;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

public class UUIDUtil {
    private static String[] chars = new String[]{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"};

    public UUIDUtil() {
    }

    public static String NS() {
        StringBuffer shortBuffer = new StringBuffer();
        String uuid = UUID.randomUUID().toString().replace("-", "");

        for(int i = 0; i < 4; ++i) {
            String str = uuid.substring(i * 8, i * 8 + 8);
            str = str.substring(i % 4, i % 4 + 4);
            int x = Integer.parseInt(str, 16);
            shortBuffer.append(chars[x % 62]);
        }

        return shortBuffer.toString();
    }

    public static String S() {
        StringBuffer shortBuffer = new StringBuffer();
        String uuid = UUID.randomUUID().toString().replace("-", "");

        for(int i = 0; i < 8; ++i) {
            String str = uuid.substring(i * 4, i * 4 + 4);
            int x = Integer.parseInt(str, 16);
            shortBuffer.append(chars[x % 62]);
        }

        return shortBuffer.toString();
    }

    public static String M() {
        StringBuffer shortBuffer = new StringBuffer();
        String uuid = UUID.randomUUID().toString().replace("-", "");

        for(int i = 0; i < 16; ++i) {
            String str = uuid.substring(i * 2, i * 2 + 2);
            int x = Integer.parseInt(str, 16);
            shortBuffer.append(chars[x % 62]);
        }

        return shortBuffer.toString();
    }

    public static String L() {
        String uuid = UUID.randomUUID().toString().replaceAll("-", "");
        return uuid;
    }

    public static String XL() {
        String uuid = UUID.randomUUID().toString();
        return uuid;
    }

    public static synchronized String timestamp() {
        SimpleDateFormat sf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
        String timestamp = sf.format(new Date());
        return timestamp;
    }

    public static String getRandom32PK() {
        return UUID.randomUUID().toString().replaceAll("-", "");
    }

    public static String getRandom32BeginTimePK() {
        Date d = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
        String timeStr = sdf.format(d);
        String random32 = getRandom32PK();
        return timeStr + random32.substring(17, random32.length());
    }

    public static String getRandom32EndTimePK() {
        Date d = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
        String timeStr = sdf.format(d);
        String random32 = getRandom32PK();
        return random32.substring(0, random32.length() - 17) + timeStr;
    }
}
